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Stock-Based Compensation (Tables)
6 Months Ended
Jun. 30, 2019
Share-based Payment Arrangement, Noncash Expense [Abstract]  
Summary of Restricted Stock Transactions

A summary of restricted and deferred stock transactions during the six months ended June 30, 2019 is as follows:

 
Number of shares
Non-vested stock awards outstanding at January 1, 2019
2,142,743

Awarded:

Time-vesting shares
260,725

Performance-based shares
202,876

Released:

Time-vesting shares
(129,174
)
Forfeitures:
 
       Time-vesting shares
(56,900
)
Performance-based shares
(129,207
)
Non-vested stock awards outstanding at June 30, 2019
2,291,063